Facilitated quantum cellular automata as simple models with non-thermal eigenstates and dynamics

Facilitated quantum cellular automata as simple models with non-thermal eigenstates and dynamics
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促进量子细胞自动机作为具有非热本征态和动力学的简单模型

DOI:
10.1088/2058-9565/aad759
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发表时间:
2018
影响因子:
6.7
通讯作者:
Zakirov, Bahti
Zakirov, Bahti
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Gopalakrishnan, Sarang;Zakirov, Bahti

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我们引入并描述了一类简单的简化量子自旋模型,其中的动力学是由于重复应用酉门而产生的。闸门在时间上是周期性的,因此它们的联合作用构成了Floquet么正。我们讨论的模型的动力学可以经典地模拟,它们的本征态可以经典地构造(尽管是高度纠缠的)。我们考虑一维和二维的各种模型:我们主要关注涉及Clifford盖茨的模型,但我们也简要讨论涉及Clifford和Toffoli盖茨的模型。其中两个模型是可积自由粒子模型;我们构造了它们的守恒密度。然而,对于所有五种模型,本征态纠缠(在所有情况下)和算符动力学(除一种情况外)都不同于一般混沌系统。此外,由于反射对称性,其中两个模型具有指数级的许多本征态,在这些本征态中,一个或多个位置与系统的其余部分“分离”。
We introduce and describe a class of simple facilitated quantum spin models in which the dynamics is due to the repeated application of unitary gates. The gates are applied periodically in time, so their combined action constitutes a Floquet unitary. The dynamics of the models we discuss can be classically simulated, and their eigenstates classically constructed (despite being highly entangled). We consider a variety of models in one and two dimensions: we are primarily concerned with models involving Clifford gates, but we also briefly discuss a model involving Clifford and Toffoli gates. Two of these models are integrable free-particle models; we construct their conserved densities. For all five models, however, the eigenstate entanglement (in all cases) and operator dynamics (in all but one case) differ from those of generic chaotic systems. In addition, two of these models have exponentially many eigenstates in which one or more sites' disentangle'from the rest of the system, as a consequence of reflection symmetry.
伊辛模型中的无限守恒电荷集
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